Development of photocatalytic CO2 reactor to utilize ultraviolet, infrared and infrared right to reaction and mass transfer, respectively

2023 Fiscal Year Final Research Report

• Project/Area Number: 21K04769
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Review Section: Basic Section 27020:Chemical reaction and process system engineering-related
• Research Institution: Mie University
• Principal Investigator: Nishimura Akira 三重大学, 工学研究科, 准教授 (60345999)
• Project Period (FY): 2021-04-01 – 2024-03-31
• Keywords: 光触媒 / CO2還元 / 赤外光応答 / プロトン供給剤

Outline of Final Research Achievements

This study focuses on (i) clarification on the amount of loaded P4O10 which absorbs the infrared light, (ii) optimization on the provider of H+ which is needed for the reduction reaction in the photocatalytic CO2 reduction.
In this study, we provided P4O10/TiO2 with different amount of loaded P4O10 by means of the sol gel and dip coating process. We characterized the prepared P4O10/TiO2 by SEM, EPMA and XPS. In addition, we selected NH3 and H2O as a provider of H+ and evaluated the characteristics of CO2 reduction changing the molar ratio of these provider of H+ and CO2.
As a result, the highest CO2 reduction performance was obtained in case of CO2:NH3 = 3:2 with the loading amount of P4O10 of 1.1 wt%. The amount of produced CO is 583 micro-mol/g under the illumination condition with infrared light only.

Free Research Field

CO2削減・利用

Academic Significance and Societal Importance of the Research Achievements

本研究では、世界で初めてTiO2系光触媒で赤外光に応答してCO2還元を実現することに成功した。P4O10をTiO2に担持した光触媒自体前例がなく、さらにTiO2に担持するP4O10の量の最適化、およびP4O10作成時のボールミル攪拌時間の最適化に成功したのも前例がない成果である。